From ca52c317f0a554dfb1f9e5ceeef416cb6eddc12e Mon Sep 17 00:00:00 2001 From: Brian Cunnie Date: Sun, 26 Dec 2021 10:13:40 -0800 Subject: [PATCH] Bring in etcd support for key-value store The addition of etcd was enough to inspire me to make a struct (`Xip`) to hold the important information (source addr, etcd client). That way I don't have to plumb that information through the hierarchy of function calls. Drive-by: fixed a bug in the random-IPv6-address-generator that would, once in a great while, generate an IPv4 address. --- bosh-release/src/sslip.io-dns-server/go.mod | 15 +- bosh-release/src/sslip.io-dns-server/go.sum | 207 +++++++++++++++++- bosh-release/src/sslip.io-dns-server/main.go | 25 ++- .../src/sslip.io-dns-server/xip/xip.go | 27 ++- .../src/sslip.io-dns-server/xip/xip_test.go | 16 +- 5 files changed, 268 insertions(+), 22 deletions(-) diff --git a/bosh-release/src/sslip.io-dns-server/go.mod b/bosh-release/src/sslip.io-dns-server/go.mod index 8a799b3..31b1e33 100644 --- a/bosh-release/src/sslip.io-dns-server/go.mod +++ b/bosh-release/src/sslip.io-dns-server/go.mod @@ -5,14 +5,27 @@ go 1.17 require ( github.com/onsi/ginkgo v1.16.5 github.com/onsi/gomega v1.17.0 + go.etcd.io/etcd/client/v3 v3.5.1 golang.org/x/net v0.0.0-20211216030914-fe4d6282115f ) require ( + github.com/coreos/go-semver v0.3.0 // indirect + github.com/coreos/go-systemd/v22 v22.3.2 // indirect github.com/fsnotify/fsnotify v1.4.9 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.2 // indirect github.com/nxadm/tail v1.4.8 // indirect - golang.org/x/sys v0.0.0-20210423082822-04245dca01da // indirect + go.etcd.io/etcd/api/v3 v3.5.1 // indirect + go.etcd.io/etcd/client/pkg/v3 v3.5.1 // indirect + go.uber.org/atomic v1.7.0 // indirect + go.uber.org/multierr v1.6.0 // indirect + go.uber.org/zap v1.17.0 // indirect + golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 // indirect golang.org/x/text v0.3.6 // indirect + google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c // indirect + google.golang.org/grpc v1.38.0 // indirect + google.golang.org/protobuf v1.26.0 // indirect gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect gopkg.in/yaml.v2 v2.4.0 // indirect ) diff --git a/bosh-release/src/sslip.io-dns-server/go.sum b/bosh-release/src/sslip.io-dns-server/go.sum index 67e0a19..2c649d2 100644 --- a/bosh-release/src/sslip.io-dns-server/go.sum +++ b/bosh-release/src/sslip.io-dns-server/go.sum @@ -1,24 +1,102 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= +github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= +github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= +github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= +github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho= 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:= []string{"localhost:2379"} + etcdCli, err := clientv3.New(clientv3.Config{ + Endpoints: etcdEndpoints, + DialTimeout: 250 * time.Millisecond, + }) + if err != nil { + log.Printf("Couldn't connect to the etcd endpoints: %s. %v\n", strings.Join(etcdEndpoints, ", "), err) + os.Exit(1) + } + defer etcdCli.Close() + conn, err := net.ListenUDP("udp", &net.UDPAddr{Port: 53}) // common err hierarchy: net.OpError → os.SyscallError → syscall.Errno switch { case err == nil: log.Println(`Successfully bound to all interfaces, port 53.`) wg.Add(1) - readFrom(conn, &wg) + readFrom(conn, etcdCli, &wg) case isErrorPermissionsError(err): log.Println("Try invoking me with `sudo` because I don't have permission to bind to port 53.") log.Fatal(err.Error()) @@ -45,7 +59,7 @@ func main() { } else { wg.Add(1) boundIPsPorts = append(boundIPsPorts, conn.LocalAddr().String()) - go readFrom(conn, &wg) + go readFrom(conn, etcdCli, &wg) } } if len(boundIPsPorts) > 0 { @@ -60,7 +74,7 @@ func main() { wg.Wait() } -func readFrom(conn *net.UDPConn, wg *sync.WaitGroup) { +func readFrom(conn *net.UDPConn, etcdCli *clientv3.Client, wg *sync.WaitGroup) { defer wg.Done() for { query := make([]byte, 512) @@ -69,9 +83,8 @@ func readFrom(conn *net.UDPConn, wg *sync.WaitGroup) { log.Println(err.Error()) continue } - go func() { - response, logMessage, err := xip.QueryResponse(query, addr.IP) + response, logMessage, err := xip.Xip{SrcAddr: addr.IP, Etcd: etcdCli}.QueryResponse(query) if err != nil { log.Println(err.Error()) return diff --git a/bosh-release/src/sslip.io-dns-server/xip/xip.go b/bosh-release/src/sslip.io-dns-server/xip/xip.go index 1e0cb98..321b266 100644 --- a/bosh-release/src/sslip.io-dns-server/xip/xip.go +++ b/bosh-release/src/sslip.io-dns-server/xip/xip.go @@ -10,9 +10,18 @@ import ( "strconv" "strings" + v3client "go.etcd.io/etcd/client/v3" "golang.org/x/net/dns/dnsmessage" ) +// Xip contains info that the routines need to answer a query that I don't want to plumb +// through the call hierarchy +// (the source address for `ip.sslip.io`, and the etcd client for `kv.sslip.io`) +type Xip struct { + SrcAddr net.IP + Etcd *v3client.Client +} + // DomainCustomization is a value that is returned for a specific query. // The map key is the domain in question, e.g. "sslip.io." (always include trailing dot). // For example, when querying for MX records for "sslip.io", return the protonmail servers, @@ -177,7 +186,7 @@ type Response struct { // 78.46.204.247.33654: TypeNS www.example.com ? NS // 78.46.204.247.33654: TypeSOA www.example.com ? SOA // 2600::.33654: TypeAAAA --1.sslip.io ? ::1 -func QueryResponse(queryBytes []byte, sourceAddr net.IP) (responseBytes []byte, logMessage string, err error) { +func (x Xip) QueryResponse(queryBytes []byte) (responseBytes []byte, logMessage string, err error) { var queryHeader dnsmessage.Header var p dnsmessage.Parser var response Response @@ -191,7 +200,7 @@ func QueryResponse(queryBytes []byte, sourceAddr net.IP) (responseBytes []byte, if q, err = p.Question(); err != nil { return nil, "", err } - response, logMessage, err = processQuestion(q, sourceAddr) + response, logMessage, err = x.processQuestion(q) if err != nil { return nil, "", err } @@ -236,7 +245,7 @@ func QueryResponse(queryBytes []byte, sourceAddr net.IP) (responseBytes []byte, return responseBytes, logMessage, nil } -func processQuestion(q dnsmessage.Question, sourceAddr net.IP) (response Response, logMessage string, err error) { +func (x Xip) processQuestion(q dnsmessage.Question) (response Response, logMessage string, err error) { logMessage = q.Type.String() + " " + q.Name.String() + " ? " response = Response{ Header: dnsmessage.Header{ @@ -464,7 +473,7 @@ func processQuestion(q dnsmessage.Question, sourceAddr net.IP) (response Respons return response, logMessage + "nil, NS " + strings.Join(logMessages, ", "), nil } var txts []dnsmessage.TXTResource - txts, err = TXTResources(q.Name.String(), sourceAddr.String()) + txts, err = x.TXTResources(q.Name.String()) if err != nil { return response, "", err } @@ -517,7 +526,7 @@ func processQuestion(q dnsmessage.Question, sourceAddr net.IP) (response Respons } } // The following is flagged as "Unreachable code" in Goland, and that's expected - return response, "", errors.New("unexpectedly fell through processQuestion()") + return response, "", errors.New("unexpectedly fell through x.processQuestion()") } // NSResponse sets the Answers/Authorities depending whether we're delegating or authoritative @@ -690,13 +699,15 @@ func NSResources(fqdnString string) []dnsmessage.NSResource { return NameServers } -// TXTResources returns TXT records from Customizations -func TXTResources(fqdn, querier string) ([]dnsmessage.TXTResource, error) { +// TXTResources returns TXT records from Customizations or KvCustomizations +func (x Xip) TXTResources(fqdn string) ([]dnsmessage.TXTResource, error) { if kvRE.MatchString(fqdn) { return kvTXTResources(fqdn) } if domain, ok := Customizations[strings.ToLower(fqdn)]; ok { - return domain.TXT(querier) + // Customizations[strings.ToLower(fqdn)] returns a _function_, + // we call that function, which has the same return signature as this method + return domain.TXT(x.SrcAddr.String()) } return nil, nil } diff --git a/bosh-release/src/sslip.io-dns-server/xip/xip_test.go b/bosh-release/src/sslip.io-dns-server/xip/xip_test.go index 7d8b21e..92a05b0 100644 --- a/bosh-release/src/sslip.io-dns-server/xip/xip_test.go +++ b/bosh-release/src/sslip.io-dns-server/xip/xip_test.go @@ -120,16 +120,17 @@ var _ = Describe("Xip", func() { }) Describe("TXTResources()", func() { + var x xip.Xip It("returns an empty array for a random domain", func() { randomDomain := random8ByteString() + ".com." - txts, err := xip.TXTResources(randomDomain, "9.9.9.9") + txts, err := x.TXTResources(randomDomain) Expect(err).To(Not(HaveOccurred())) Expect(len(txts)).To(Equal(0)) }) When("queried for the sslip.io domain", func() { It("returns mail-related TXT resources for the sslip.io domain", func() { domain := "ssLip.iO." - txts, err := xip.TXTResources(domain, "8.8.8.8") + txts, err := x.TXTResources(domain) Expect(err).To(Not(HaveOccurred())) Expect(len(txts)).To(Equal(2)) Expect(txts[0].TXT[0]).To(MatchRegexp("protonmail-verification=")) @@ -140,15 +141,18 @@ var _ = Describe("Xip", func() { customizedDomain := random8ByteString() + ".com." xip.Customizations[customizedDomain] = xip.DomainCustomization{} It("returns no TXT resources", func() { - txts, err := xip.TXTResources(customizedDomain, "1.1.1.1") + txts, err := x.TXTResources(customizedDomain) Expect(err).To(Not(HaveOccurred())) Expect(len(txts)).To(Equal(0)) }) delete(xip.Customizations, customizedDomain) // clean-up }) When(`the domain "ip.sslip.io" is queried`, func() { + BeforeEach(func() { + x.SrcAddr = net.IP{1, 1, 1, 1} + }) It("returns the IP address of the querier", func() { - txts, err := xip.TXTResources("ip.sslip.io.", "1.1.1.1") + txts, err := x.TXTResources("ip.sslip.io.") Expect(err).To(Not(HaveOccurred())) Expect(len(txts)).To(Equal(1)) Expect(txts[0].TXT[0]).To(MatchRegexp("^1.1.1.1$")) @@ -156,7 +160,7 @@ var _ = Describe("Xip", func() { }) DescribeTable(`the domain "kv.sslip.io" is queried`, func(fqdn string, txts []string) { - txtResources, err := xip.TXTResources(fqdn, "querier's IP address doesn't matter") + txtResources, err := x.TXTResources(fqdn) Expect(err).ToNot(HaveOccurred()) Expect(len(txtResources)).To(Equal(len(txts))) for i, txtResource := range txtResources { @@ -377,6 +381,8 @@ func randomIPv6Address() net.IP { } } } + // avoid pathological case: an IPv4 address []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, ?, ?, ?, ?}) + ipv6[10] &= 0xfe return ipv6 }